1) Find the pH of (a) 0.050 M HClO4 and (b) 0.050 M HClO4 plus 0.050 M HBr.
2) what concentration of Ca2+ must be added to 0.010 M oxalate (C2O^-2 4) to precipitate 99.0% of the oxalate.
3) write the Kb reaction of hypochlorite, OCl-. Given that the Ka valuse for HOCl is 3.0x 10^-8 calculate Kb for OCl-